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> Bad Amp Tube?
SDMF75
post Oct 23 2007, 12:15 PM
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Do amp tubes go out all at once or do they slowly die out and make your amp sound progressively worse? It started out sounding like a crack in the speaker but now it's really fuzzy sounding and seems to have lost power.


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Andrew Cockburn
post Oct 23 2007, 08:12 PM
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QUOTE (SDMF75 @ Oct 23 2007, 07:15 AM) *
Do amp tubes go out all at once or do they slowly die out and make your amp sound progressively worse? It started out sounding like a crack in the speaker but now it's really fuzzy sounding and seems to have lost power.


Amp tubes have a service life, and towards the end they usually sound dull and uninspired ... I would have an amp tech look at replacing your power tubes as a first step, although it could actually be a crack in your speaker - can you try it with a different cab just to check? How old is the amp BTW? It could also be bad capacitors if it is 20 years old or more.


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jammer91
post Oct 23 2007, 08:16 PM
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My Vox amp has started to sound really muddy since i put the volume at full blast in a band practice.


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SDMF75
post Oct 23 2007, 09:01 PM
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QUOTE (Andrew Cockburn @ Oct 23 2007, 08:12 PM) *
Amp tubes have a service life, and towards the end they usually sound dull and uninspired ... I would have an amp tech look at replacing your power tubes as a first step, although it could actually be a crack in your speaker - can you try it with a different cab just to check? How old is the amp BTW? It could also be bad capacitors if it is 20 years old or more.


I haven't tried it with any other cabs. It's an ART combo that's probably at least 11-12 years old. I pulled the grill off over the weekend and there are no cracks in the speaker but there was one small area around the cone that looked as if it may be separating so I put some sealant in there, let it dry and tried again and it made no difference. It just got really bad last night just as I was getting ready to record my part of the Instyle of you collab. The volume dropped and it started busting in and out and just sounded awful. Thanks for the help! I'm gonna try to find a repairman today.


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Ibanez Iceman w/ DiMarzio Super Distortion in the Bridge and DiMarzio Humbucker from Hell in the Neck
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Lyon Def Leppard Special Union Jack (to go under construction soon - 1st thing to be removed will be the Def Lep logo on the headstock and then off to change the pickups etc. - plays pretty well for a Target special)
Washburn KC-40 (in pieces and about to be re-painted)
Yamaha Classical Acoustic

Bass - Signed Gene Simmons Punisher Tobacco Sunburst #345 - Collector purposes only

Amp - Roland Cube 60, Roland MicroCube

Effects - Ibanez Weeping Demon Wah


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MickeM
post Oct 23 2007, 10:13 PM
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QUOTE (SDMF75 @ Oct 23 2007, 10:01 PM) *
I haven't tried it with any other cabs. It's an ART combo that's probably at least 11-12 years old. I pulled the grill off over the weekend and there are no cracks in the speaker but there was one small area around the cone that looked as if it may be separating so I put some sealant in there, let it dry and tried again and it made no difference. It just got really bad last night just as I was getting ready to record my part of the Instyle of you collab. The volume dropped and it started busting in and out and just sounded awful. Thanks for the help! I'm gonna try to find a repairman today.

Now I don't know the part names of a speaker but cones etc are sometimes made worn in the edges (comes with a name that I don't recall atm) and I'm not sure glue or sealant is the way for that. Now maybe what you found was something broke, I don't know.

Issues with volume drops could very well be the tubes. Could also be from bad pots. I had an amp once which had both and I experienced just that. They fixed the pots (volume one causing it), changed tubes and spayed with electric spray and it was like new again.


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